I bought a wifi router online via MTN for R295 unlimited data

I bought a wifi router online via MTN for R295 unlimited data. The router has no connection. I went to return it at the MTN Festival Mall store they told me their printer is not working. I went to East Rand Mall MTN store they told me l cant return it because l have to call MTN call centre to log in return but the sales lady who sold me the router told me l can return it at any MTN store without any hussles. I sent email to MTN they responded telling l must remove sim and put it back on. I did that but still there is no signal. Their call centre employees dont check if the area has network coverage. Its all about sales to them not quality service.Very bad service from MTN l have been sent from pillar to post with no solutions.